[Backport stable-25-2] Use default value of BufferPageAllocSize from proto

[abyss7]

Description

Backport of #28237 to stable-25-2.

[github-actions]

⚪ 2025-11-06 16:47:24 UTC Pre-commit check linux-x86_64-release-asan for 6e99334 has started.
⚪ 2025-11-06 16:47:28 UTC Artifacts will be uploaded here
⚪ 2025-11-06 16:50:33 UTC ya make is running...
🟡 2025-11-06 18:21:06 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet Going to retry failed tests...

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
12700	12255	0	291	122	32

⚪ 2025-11-06 18:22:17 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-11-06 18:38:12 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet Going to retry failed tests...

Test history | Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
512 (only retried tests)	403	0	10	68	31

⚪ 2025-11-06 18:38:23 UTC ya make is running... (failed tests rerun, try 3)
🟢 2025-11-06 18:50:05 UTC Tests successful.

Test history | Ya make output | Test bloat | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
141 (only retried tests)	108	0	0	2	31

🟢 2025-11-06 18:50:13 UTC Build successful.
🟢 2025-11-06 18:50:41 UTC ydbd size 3.8 GiB changed* by +496 Bytes, which is < 100.0 KiB vs stable-25-2: OK

ydbd size dash	stable-25-2: 2c75e98	merge: 6e99334	diff	diff %
ydbd size	4 049 949 040 Bytes	4 049 949 536 Bytes	+496 Bytes	+0.000%
ydbd stripped size	1 409 673 656 Bytes	1 409 673 912 Bytes	+256 Bytes	+0.000%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

🟢 2025-11-06 16:49:22 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-11-06 16:49:32 UTC Pre-commit check linux-x86_64-relwithdebinfo for 6e99334 has started.
⚪ 2025-11-06 16:49:46 UTC Artifacts will be uploaded here
⚪ 2025-11-06 16:52:40 UTC ya make is running...
🟡 2025-11-06 17:42:37 UTC Some tests failed, follow the links below. Going to retry failed tests...

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
26673	25330	0	6	1291	46

⚪ 2025-11-06 17:44:58 UTC ya make is running... (failed tests rerun, try 2)
🟢 2025-11-06 18:06:12 UTC Tests successful.

Test history | Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
161 (only retried tests)	120	0	0	3	38

🟢 2025-11-06 18:06:22 UTC Build successful.
🟢 2025-11-06 18:06:40 UTC ydbd size 2.2 GiB changed* by +192 Bytes, which is < 100.0 KiB vs stable-25-2: OK

ydbd size dash	stable-25-2: 2c75e98	merge: 6e99334	diff	diff %
ydbd size	2 327 016 536 Bytes	2 327 016 728 Bytes	+192 Bytes	+0.000%
ydbd stripped size	487 606 504 Bytes	487 606 568 Bytes	+64 Bytes	+0.000%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}